Concrete insert anchor



Feb. 5, H KULP ET AL CONCRETE INSERT ANCHOR Filed Dec. 3, 1932 Patented Feb. 5, 1935 PATENT OFFICE CONCRETE INSERT ANCHOR Harry W. Kulp and Martin C. Dellinger, Lancaster, Pa., assignors to K-D Manufacturing Company, a corporation of Pennsylvania Application December 3, 1932, Serial No. 645,597

5 Claims.

This invention relates to anchors which may be embedded in concrete to anchor thereto another part such as metal lathe by means of any usual tie elements extending through the exposed ends of said anchoring means, for instance, such as the usual pencil rods, and also relates to blanks for forming such anchoring means or insert anchors.

The primary objects of the present invention 1 are to provide an insert anchor of simple construction and which may be driven into the usual mold form board by hammering prior to the pouring of the concrete into the mold form; to provide such an anchor with stop shoulders to limit the penetration of the insert into the mold form to the end that said inserts may be uniformly positioned in the mold so as to extend to a uniform degree or extent from the face of the concrete in which their bodies are embedded when the mold form is removed; to provide such an insert with upwardly and outwardly oppositely curved side edge faces to engage the said concrete mass in opposition to each other; to corrugate lengthwise of the anchor insert the body thereof between said side edges with corrugations of a cross sectional size decreasing from the upper edge of the body downward to a point slightly above the stop shoulders, where said corrugations merge with the fiat face of the plate, said corrugations having the functions of providing a wide hammering edge face or head, of bracing the insert in a lengthwise direction against deformation under the hammer blows, and of providing a firm interlocking grip between the I concrete and embedded portion of the anchor insert. A further object is to provide a novel form of blank from which said anchor insert may be formed up by a simple stamping or corrugating operation, said blank being so formed as to avoid waste in stamping a plurality of blanks in inverse relation from a strip of sheet steel without any waste of material other than that incident to the stamping out of the holes C in the blades or tangs A.

In the accompanying drawing:

Figure 1 represents a perspective view of an insert anchor embodying our invention;

Figure 2, a sectional view on line 22 of Fig. 3 representing a section of a ceiling in which insert anchors according to our invention are employed, the bodies thereof being indicated in dotted lines and the tangs being shown in full lines with the pencil rods shown in section as extending through the holes C thereof;

Figure 3, a section on line 3-3 of Fig. 2;

Figure 4, a plan view illustrating a plurality of fullsize blanks fitted together in inverse relationship, showing how they are stamped from a narrow strip of sheet steel; and

Figure 5 is made to actual full-size scale from a commercial device and represents a side elevation of an anchoring insert anchor embodying our invention with the bottom board G of the molding form indicated in dotted lines with the shoulders 1 in engagement with the top of the said board G to illustrate the manner of positioning the insert anchors in the molding form prior to the pouring of the concrete.

Referring now in detail to the drawing, A represents the driving blade or tang integral with the body B of the insert anchor and having a hole 0 formed in its lower portion to receive any usual attaching means, for instance, to receive endwise a cooperating anchoring or pencil rod D which will extend lengthwise through the said registering hole C of a plurality of insert anchors, as illustrated in Figs. 2 and 3; F represents a concrete ceiling or flooring having depending concrete joists E, as usual; G designates the usual mold board fitting against the lower face of one of said joists E, and H represents one of the side boards fitting against one of the sides of one of said joists E incident to the pouring and setting of said joists.

Our improved insert anchor will be stamped from a. suitable thickness of sheet metal, preferably sheet steel, and is to be positioned in the bottom board G of the mold form at definite regular intervals along the central line thereof for the full length thereof and to this end will have their tangs A driven into said board G until the shoulders 1 at the point of mergence of the body B and tang A engage the upper face of the board G, as illustrated in Fig. 5.

The blanks from which the finished insert anchor is formed are designed with upper straight short side edge portions 3, with two reversely gently curved edges 2 of the one blank serve to respectively define the reversely inwardly downwardly curved edge face of one side of the tang A of each of the adjacent inversely presented insert anchor blanks, the side edges of the strip of sheet metal forming the upper edges 4 of the insert anchor blanks as severed from said metal strip.

After the blanks have been formed as illustrated in Fig. 4, which is drawn to actual full-size scale, the body B will be stamped or corrugated to form a plurality of corrugations 5 extending from the top edge 4 downward toward the driving blade or tang A, said corrugations being of greatest cross corrugations, providing an the edges 3, which are straight and parallelin the blank, are drawn in slightly so as to convergeupwardly toward each other.

The form of the body 13 is so designed that the shoulders 1 will provide for uniformity of positioning in the mold board G, the side edges 2 will be in firm contact for their full length with the opposed face of the concrete and will, operate for their full length in opposition to each other to resist any pull on the anchor as a whole, and the corrugations 5 are so formed as to provide for the fullest possible free entry of the concrete mass, as poured, into intimate contact with all faces of both sides of all of .said intimate bonding with the concrete mass as set resisting, by engagement on both faces and in stresses exerted in all directions, any pull exerted on said insert anchor lengthwise thereof.

Although the lengthwise corrugated form as illustrated in Figs. 1 to 3 and 5 is preferred as affording the more eiiicient bonding orgrip with or in the. concrete mass, it is obvious that corrugations extending lengthwise, while preferred,

are not necessary, they may, extend in other directions or for that matter the corrugations may be entirely omitted and the insert simply leftin its fiat plate. condition, as illustrated in Fig. 4, as it is cut out of the strip of sheet metal, and may be efficientlyused inthat exact condition.

Having thus described our invention, what we claim as new and desire to secure by Letters Patent is:

l. A sheet metal insert anchor forconcrete comprising a plate-like body portion adapted to be embedded in concrete, and a pointed blade portion extending downwardly from said body portion and adapted to be driven into a form, said body having its upper portion corrugated lengthwise of the anchor to form an intimate bond with the concrete mass and having its side edges upwardly and divergently curved in oppo-' comprising a plate-like body portion adapted to be embedded in concrete, and a pointed blade portion extending downwardly fromsaid body portion and adapted to be driven into a form; said body having its 'upper portion corrugated to form an intimate bond withthe concrete mass and having its side edges upwardly and divergently curved in opposition to each other to engage the opposed faces of the set mass of concrete and being formed with abrupt downwardly presented shoulders extending laterally from the upper portion of said blade portion in the plane thereof, said shoulders functioning as form enits lower part to facilitate attachment of an anchored part therein.

3. A sheet metal insert anchor for concrete comprising'a plate-like body portion adapted to be embeddedv in concrete, and a blade portion extending downwardly from said bodyportion and adapted to be driven into a form, said body having its' side edges upwardly and divergently curvedin opposition to each other to engage the opposed faces of the set mass of concrete and being formed with abrupt downwardlypresented shoulders extending laterally from the upper portion of said blade portion in the plane thereof, said shoulders functioning as form engaging stops, and said blade being exposed when the form is removed and having an opening in its lower part to facilitate attachment of an anchored part thereto.

4. A sheet metal blank for an insert anchor for concrete comprisinga flat body portion and a driven blade portion, said body, portion having. opposed upwardly and divergently curved side gaging stops, and said blade beingexposed when y the form is removed and having an opening in portion at the point of juncture of said .bodyl portion and said blade portion to function as form engaging stops, and said blade portion having an opening in its lower part to facilitate attachment of an anchored part thereto, and having its edge. faces curved downwardly and converging. at the point of said blade portion and corresponding in length and degree of cur-v.

vature to the curved side edge faces of, said body portion.

5. A sheet metal blankfor an insert anchor for concrete comprising a fiat body portion. and

a driven blade portion, said body portion having opposed upwardly and divergently, curved side same horizontal plane and being of equal length transversely of said blank and respectively disposed on opposite sides of the blade portion at thepoint of juncture of saidbody portion, and

said blade portion to function as form engaging stops, and said blade portion having its edge faces curved downwardly and converging atthe point of said blade portion and correspondingin length and degree of curvature to the curved side edge faces of said body portion.

' HARRY w. MARTIN .o. DELLINGER. 

